Katy's Rodney Anderson rushed for 225 yards and three TDs on 17 carries against Johnson.

Katy's Rodney Anderson rushed for 225 yards and three TDs on 17 carries against Johnson.

Photo: Smiley N. Pool / Houston Chronicle

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Katy running back Rodney Anderson (26) leaves the Johnson defense in his wake on a 77-yard touchdown run during the first half of a Class 5A state semifinal high school football playoff game at Reliant Stadium on Saturday, Dec. 14, 2013, in Houston. ( Smiley N. Pool / Houston Chronicle ) less

Katy running back Rodney Anderson (26) leaves the Johnson defense in his wake on a 77-yard touchdown run during the first half of a Class 5A state semifinal high school football playoff game at Reliant Stadium ... more

Photo: Houston Chronicle

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Johnson wide receiver Santana Barrera (28) is knocked off his feet for a loss by Katy linebacker Jason Ellis (24) during the first half of a Class 5A state semifinal high school football playoff game at Reliant Stadium on Saturday, Dec. 14, 2013, in Houston. ( Smiley N. Pool / Houston Chronicle ) less

Johnson wide receiver Santana Barrera (28) is knocked off his feet for a loss by Katy linebacker Jason Ellis (24) during the first half of a Class 5A state semifinal high school football playoff game at Reliant ... more

Photo: Houston Chronicle

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Johnson quarterback Hunter Rittimann (12) is sacked by Katy defensive lineman Jesse Brown (99) during the first half of a Class 5A state semifinal high school football playoff game at Reliant Stadium on Saturday, Dec. 14, 2013, in Houston. ( Smiley N. Pool / Houston Chronicle ) less

Johnson quarterback Hunter Rittimann (12) is sacked by Katy defensive lineman Jesse Brown (99) during the first half of a Class 5A state semifinal high school football playoff game at Reliant Stadium on ... more

Photo: Houston Chronicle

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Johnson's run ends with blowout to Katy

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HOUSTON — Johnson's run to the state semifinals started more than a decade ago, when Ron Rittimann got his son Hunter hooked on football.

They helped Johnson spend the last month as Giant Killers, toppling a string of area favorites, but Katy was too much in a 52-0 victory over the Jaguars in the Class 5A Division II state semifinal.

The Rittimanns, father and son, both were in tears at Reliant Stadium on Saturday. They hugged after the game, standing on the field for the last time together as a coach and his quarterback.

“I couldn't be prouder of him,” said Ron, who has been the Jaguars' coach since the school opened in 2008. “But it had to end sometime.”

Hunter, Johnson's senior quarterback, had been nearly flawless in the playoffs, throwing five touchdown passes last week in a 42-41 victory over Steele.

Johnson (12-3), which hadn't won a playoff game before this season, defeated a 10-0 Smithson Valley team, Brandeis (10-1) and Steele (12-1) to get to the semifinals.

On offense, Johnson didn't have a first down until 4:52 remained in the second quarter, when Katy was called for a roughing-the-kicker penalty.

The Jaguars entered Saturday averaging 44.8 points, but Rittimann was sacked four times in the first half, leaving Johnson in negative yardage until there was less than two minutes left in the second quarter.

Katy has three victories at Reliant Stadium this season. The Houston Texans have one.

“It's always tough when you end the run, but we lost to a better team today,” Ron Rittimann said. “This is going to sting for a while, but we'll be able to look back and say this was a great year.”

Hunter Rittimann finished the season with 2,883 passing yards, 32 TDs and seven interceptions, along with 834 rushing yards and 14 rushing TDs. He was held to 62 passing yards and minus-2 rushing Saturday.